Give me a sec while i type it.
At the start, immediatly equip your face camo and MK. 22. Go all the way to the right side of the ship and duck behind the wall that putrudes out because of the stairwell. There is an explosion here just before 2 frogs pop down. One on your right and one near the railing above you. Quickly lean out and shoot the frog on your right in the head to make her fall asleep. Crouching, walk past her and when you pass the box she was infront of, continue walking foward staying close to the wall and grab the next green box sticking out hugging the right wall. When your crouched behind that peak out quick and put the frog thats about to pass it asleep. As you do that, 3 more frogs should appear. Put them out. As soon as they are all down, sprint pass them go around the building on the deck until you war on the exreme right side of teh ship again. Hug the cylindar pillar to slip past the boxes blocking the side and run up to and crouch behind a gray box next to the other pillar. Lean out and shoot the 2 frogs that leap down from the top of teh ship. Once they are asleep, crawl foward a bit until you can see another frog on the balcony to the left of where the first two jumped off from. Put her to sleep then continue crawling foward until the pillar behind you blocks the frogs that are are now patroling behind. Next to come canisters where the 2 frogs lay is a wall that you shoudl lean out of and put another frog on the top of the ship directly across from the one you just put down. You have 30 seconds or so until the frogs behind you notice the bodies sleeping so make sure you hiding behind the boxes next to the door by then. The gekko are easy to avoid. As soon as the second blast from the ship hits the gekko, it means its going to blow up soon. As its falling, run to the door and mash triangle until it opens. You should be in before the second patrolling gekko spots you.
Hope that helps.